LAN Mei,YING Yuan-yuan,LUO Hai-hui,et al.Sludge Conditioning Mechanism of Typical Wastewater Treatment Processes[J].China Water & Wastewater,2023,39(15):94-100.
Sludge Conditioning Mechanism of Typical Wastewater Treatment Processes
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第15期
Page:
94-100
Column:
Date of publication:
2023-08-01
- Keywords:
- sludge dewatering; persulfate; fluorescent protein; EEM
- Abstract:
- This paper conditioned the municipal sludge produced by three different processes by divalent iron activated peroxynitrite (PMS), and analyzed the changes in fluorescent protein composition and content of municipal sludge after peroxynitrite advanced oxidation treatment and its effect on improving sludge dewatering performance by three-dimensional fluorescence spectroscopy (EEM) and parallel factor analysis (PARAFAC). Tryptophan-like protein was an important factor affecting the sludge dewatering performance, and reducing tryptophan-like protein content effectively improved the sludge dewatering performance. From the perspective of structure, the content of tryptophan?like protein in extracellular polymeric substance (EPS) of municipal sludge gradually decreased from the inner layer of tightly bounded EPS (TB?EPS) to the outer layer of soluble EPS (S-EPS), in which TB-EPS was the microbial protective layer that determined the sludge dewatering performance. However, the excess sludge from wastewater treatment processes represented by oxidation ditch was more difficult to dewater than the excess sludge from AAO and MSBR, which was due to the protection of spores or other dormant bodies formed by microorganisms in the oxidation ditch process during the endogenous respiratory period. Therefore, the conditioning and dewatering of sludge from oxidation ditch needs to be realized by other more targeted conditioning technologies.
Last Update:
2023-08-01